Syringe Test - rates of reaction.

Plan

• Starting with a 0.25 molar.
• Fill a flask with 5cm³ 1 molar hydrochloric acid and 15cm³ of distilled water this will reduce the molar to 0.25.
• The Tubing should be attached to the gas syringe and the other end put in a bung which will be eventually be inserted in the lid of the flask (fig 1).
• At the last second before the bung in put on top the marble chips (2gs) should be put in to the 2.5 hydrochloric acid so to catch the full about of gas given off and the.

• The temperature should be checked every 20 seconds over 200 seconds.
• To ensure for accurate results the test should be repeated multiple times the more times it’s done the more accurate the results will be.
• Finally you should gradually change the molar from 0.25 to 2 (0.25, 0.5, 0.75, 1, 2)

Predictions

I predict that the higher the molar used the quicker the acid will react with the marble chips and in turn the speed of the gas emitted is faster although there will be no change in the amount of acid produced. If left long enough all the experiments will emit the same amount of gas, the change of molar will only affect the speed it takes. The reason this happens is because of the collision theory, this states that when a molar is increased it means that there are more acid particles in the same space for example a 0.25 molar acid the will be x amount of acid in one area but in a 0.5 molar the will be twice the amount of x in the same amount of space( Fig 2 and Fig 3). This prediction came from my preliminary results although I only had time to do 2 tests I try 0.25 molar and 2 molar so I would get a good contrast in results from this I find that at 0.25 molar I got a very slow reaction and was only at 3 by the end, but in contrast 2 molar acid was very fast for and the numbers were off the scale before I had finished timing the experiment.

Conclusion

From the experiment I carried out I found that an increase in the molar strength would decrease the amount of time for the reaction to finish, at 0.25 the reacting of the marble chips was very slow by the end of 200 seconds it was only at an average of 3.5, as the molar increased the speed of the amount of gas produced increased and at 2 molar the results were coming off the chart at only 140 seconds which is a massive increase of the original. Thus proving the collision theory that when an increase in concentration of an acid or reactant happens the reacting takes a shorter amount of time because there are more particles in the same space leading to more successful collisions which then reduces the amount of time taken for the reaction to finish.

Explanation

If I did this experiment again I would try to repeat the experiment again so I can get a more accurate average between the 3 results which would make them more useful to support my prediction and evidence to make my ideas and prediction be more beneficial for my conclusion. I would also take note of how many blocks were used and make a mention of how these effect the experiments.

Results table